When you run into a situation where you don't know how to proceed in there are multiple problems, it is good to break the problem down into several, smaller problems. Let's start by removing the dynamic query. It will be easier to solve the problem with a non-dynamic query. Once you...
This will translate to a where in clause in Linq to SQL... var myInClause = new string[] {"One", "Two", "Three"}; var results = from x in MyTable where myInClause.Contains(x.SomeColumn) select x; // OR var results = MyTable.Where(x => myInClause.Contains(x.SomeColumn));...
var query = from item in dataSource [join clause] [where clause] [group by clause] [orderby clause] select item;from：指定数据源和范围变量，用于指定要查询的集合或数据源以及每个元素的范围变量。join：用于指定多个数据源之间的关联操作。where：用于指定筛选条件，过滤满足特定条件的...
I am sorry but I don't know LINQ enough to make the translation from XML to SQL. I have a Dictionary<string, List<string>> that I want something like the following where clause: where oi.Sku == skuValue || (dictionary.ContainsKey(oi.Sku) && dictionary[oi.Sku].Contains(skuValue)) S...
WHERE col3 = 'value1' How can I implement same query in my datatable? Thanks All replies (5) Monday, September 26, 2011 7:04 PM ✅Answered Hi 1plus1is3; In the following query DataTable should be replaced by the instance name of the DataTable. Where you see Field<string> the ...
在LINQ的where子句中传递动态条件可以通过使用Expression树来实现。Expression树可以在运行时创建和修改LINQ查询,从而实现动态查询条件。 首先,我们需要使用System.Linq.Expressions命名空间,并创建一个Expression<Func<T, bool>>类型的表达式树变量,其中T是查询的目标实体类型。 然后,可以使用Expression类的静态方法来构建具体...
but clearly it must be the case that the entire "let" projection is executed from start to finish over the whole sequence in order to get the resulting pairs to be sorted by the "orderby" clause. Executing the "let" projection lambda three times causes "tmp" to be mutated three times....
This example is a valid query by itself; however, the query becomes far more powerful when you add more query clauses to refine the result. For example, you can add aWhereclause to filter the result by one or more values. Query expressions are a single line of code; you can just appe...
var query = petOwners .SelectMany(petOwner => petOwner.Pets, (petOwner, petName) => new { petOwner, petName }) .Where(ownerAndPet => ownerAndPet.petName.StartsWith("S")) .Select(ownerAndPet => new { Owner = ownerAndPet.petOwner.Name, Pet = ownerAndPet.petName } ); // Prin...
(',')whereConvert.ToInt32(splitName[2]) == Convert.ToInt32(splitScoreLine[0])select(FirstName: splitName[0], LastName: splitName[1], ExamScores: (fromscoreAsTextinsplitScoreLine.Skip(1)selectConvert.ToInt32(scoreAsText)) .ToList() );// Display each student's name and exam score...